Specific gravity (G) is a measure of wood density affected by the specific species or species combination of the commercial grade, growth region, and grading rules. It is the single most important lumber property for the strength of mechanical fasteners, such as nails and screws used in...

Fire retardant lumber, also called FRTW, is used when a project has a requirement to reduce the structures’ ability to burn and to reduce the structures’ contribution to the spread of fire. Most fire retardant materials also reduce the development of smoke and the release of...

As North America’s largest lumber manufacturer, West Fraser supplies the truss market with mechanically graded lumber, dimension lumber, and premium products such as Prime, Select Structural, and HiLine. Founded nearly seven decades ago West Fraser began operations in 1955 when...

Face the facts. Trusses are large and bulky. They take up a lot of space and often cannot be stored inside. They have a shelf life. What are the factors that need to be considered? Are there ways to extend the shelf life of trusses? Are any of the methods currently used counterproductive? In...

As a follow-up to our January 2021 All Things Wood article by Frank Woeste and Don Bender, “Hybrid Lumber” Grade Stamps Require Special Attention, we are pleased to report that additional information is now available for designers and code officials. The following article appears...

Lumber properties are influenced by species and growing region. Species with similar design properties are combined into species groups, as shown in Tables 4A, 4B, and 4F of the NDS Supplement[1]. For example, a common species group in the southeastern U.S. is Southern Pine (SP), which includes...

There are many steps in the process of bringing lumber to the truss plant to be used in our trusses. Lumber must be harvested then sawn. Drying and planing brings the lumber closer to potential use, but it is not until the lumber makes it through the grading process that it is suitable for use....

When I saw the article on ceiling separation, The Enduring Problem of Truss Partition Separation, written by my friend Frank Woeste in the November issue of The Advertiser, I was excited to read it. As Frank writes, this problem has been around since there has been a metal plate connected wood...

For more than 40 years, truss partition separation, often loosely referred to as “truss uplift,” has been a practical (and annoying) issue for homeowners and homebuilders. While it was first investigated at the field level and researched in the laboratory in the 1970s, an October...

The largest expense in a truss plant’s operation is the lumber cost. It often represents 50% to 60% of the selling cost of the truss. With such a high percentage, most managers are always focused on saving lumber, optimizing lumber, and searching for the best price. Those aspects are...